I'm about to uninstall and reinstall a Steam game. Unfortunately, while I have mods and other user files mixed within the game's own folder, the game files themselves take up a ton of space so I'd rather not have to back up all its contents before uninstalling.

Will the "Delete Local Content..." option delete everything in a game's folder, or will it preserve third-party files? If it doesn't preserve third-party files, it looks like I'll have to back them up manually.

In case it matters, the game I'm uninstalling is Team Fortress 2. Apparently, major updates have a bad habit of borking my game.